 *{
	margin: 0;
	padding: 0;
}
#box{
	height: 682px;
	width: 1024px;
	position: relative;
	margin: 0 auto;
}

#list{
	position: absolute;
	list-style: none;
	left: 400px;
	bottom: 20px;
}
#list li{
	float: left;
	width: 20px;
	height: 20px;
	margin-left: 10px;
	background-color: #fff;
	border-radius: 50%;
	line-height: 20px;
	text-align: center;
}

.bt{
	width: 50px;
	height: 80px;
	font-size: 30px;
	background-color: rgba(0,0,0,0.2);
	color: #fff;
	line-height: 80px;
	text-align: center;
	top: 300px;
	position: absolute;
}
#left{
	left: 0;
}
#right{
	right: 0;
}